God can—and does—work through anyone and everything, including our sin and failures. Just look at the book of Judges for instance. We see flawed man after flawed man leading the floundering nation of Israel. Each time, God uses even their sin to accomplish his own purposes! It’s not just that their sin can’t derail God’s plan; it’s that God uses their inevitable sin as part of His plan. Of course, using sinners and their sin makes sense since God only has sinners to work with!

https://www.str.org/w/god-can-work-through-anyone-and-everything-even-you-and-your-sin